This is what we believe: behind every great building is a great team. And when you work with us, that’s exactly what you get — people who care, who show up, and who stand by their work, so your building works better.
And when the project’s over, we’re just getting started. Our service team keeps everything running smoother, cleaner, longer. We help customers stay efficient, stay compliant, and stay ahead.
We are committed to building a truly inclusive culture where equitable pathways are paved and a sense of belonging thrives for all, standing together as one MacDonald-Miller. It’s the responsibility of each of us individually to lead the way to real and lasting change.
As a design-build mechanical contractor, we employ a team of world-class engineers who create energy-saving solutions that meet or surpass the sustainability goals of our clients. Whether a project is in design, under construction, or an existing building ripe for improvements, we have innovative solutions that can help customers meet their goals.
MacDonald-Miller ranked #1 Best Workplaces in Washington in 2025!
It’s an honor to be on the Top 100 Best Workplaces list from Puget Sound Business Journal for the fourth time. This year, we were named #1 in the extra-large category. Thank you to all the MacMiller employees who make this company one of the best workplaces in the Pacific Northwest!
We’ve helped shape the local landscape for over half a century with buildings that operate in the most efficient manner possible. We like to think we’re saving the planet one building at a time.
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